Manganese toxicity from food alone has not been reported, although some diets provide as much as 20 mg daily. The Food and Nutrition Board has set a rather conservative tolerable upper intake level (UL) of 11 mg for adults. The UL for children ranges from 2 mg to 6 mg and the UL for adolescents is 9 mg. High levels of manganese from drinking water may cause nerve problems similar to Parkinson’s disease. The EPA recommends 0.05 milligrams per liter as the maximum allowable manganese concentration in drinking water.
To summarize, manganese is a lesser-known nutrient with many important functions. Manganese assists wound healing by helping to synthesize collagen. Manganese has great importance in activating an antioxidant in the mitochondria of the cells.
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